Studies on anti-tumor chemical constituents in exocarps of Juglans mandshurica / 中草药

ABSTRACT

Objective: To study the chemical constituents from the exocarps of Juglans mandshurica which was an anti-tumor herb. Methods: The chemical constituents were isolated from the EtOAc and CHCl3 extracts by solvent extraction, repeated silica gel, Sephadex LH-20 column chromatography, and preparative high performance liquid chromatography. Their structures were elucidated by physicochemical properties and spectral data analysis. Results: Thirteen compounds were identified as 4(R)-ethoxy-8- hydroxy-α-tetralone (1), 4(R)-regiolone (2), ethyl gallate (3), Methyl 4-hydroxyphenylacetate (4), 8-hydroxyl anthraquinone-1- carboxylic acid (5), 4(R),5-dihydroxy-α-tetralone (6), myricanol (7), Juglanin B (8), 5-deoxymyricanone (9), 5-hydroxy-1- (4'-hydroxyphenyl)-7-(4″-hydroxy-3″-methoxyphenyl)-3-heptanone (10), broussonol E (11), Kaempferol-3-O-α-L-rhamnoside (12), quercetin-3-O-α-L-rhamnoside (13). Conclusion: Compounds 3-5, 7, and 9-13 are isolated from the exocarps of J. mandshurica for the first time, and the prenylated flavonoids were firstly reported in this genus.